Contrasting shell morphology, ingestion and grazing preferences in the neritid gastropod Smaragdia viridis (L.) on two seagrass species

► Shell morphology, growth and feeding of a micrograzer were studied on two seagrasses. ► Shell and radular morphology are different amongst seagrasses. ► Ingestion is higher in Cymodocea nodosa but absorption is higher in Zostera marina. ► A preference for Zostera marina occurs when both seagrasses are available. ► Growth in both seagrasses is similar, suggesting similar benefits for the neritid.